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The libm template machinery includes a macro declare_mgen_alias_2, to
define two function aliases rather than one. This macro is only used
in one place, to define ldexp and scalbn, and only has one nondefault
definition, for double in the case where long double has the same
format. That definition is because declare_mgen_alias for double, in
that case, defines <internal-func>l as an alias of <internal-func>, so
cannot be called twice for aliases of the same function.
Now, I suspect the <internal-func>l aliases are generally not needed
(with maybe a few exceptions such as __clog10l, which is an exported
function). But even in the presence of them, there is no need for a
special declare_mgen_alias_2 macro for this case. This patch
eliminates the need for such a macro by defining __wrap_scalbn<suffix>
as an alias of __ldexp<suffix>, and then using that when defining the
scalbn public aliases. This is similar to how such internal aliases
are created for functions with multiple symbol versions, for example.
Tested for x86_64, and with build-many-glibcs.py. (There *are* some
cases where installed stripped shared libraries change - not in the
generated code but because such changes to static symbols on input to
ld, even nonexported symbols that don't affect the code or dynamic
symbols, can affect the particular representation in the output of
string tables, hash tables etc.)
* sysdeps/generic/math-type-macros.h [!declare_mgen_alias_2]
(declare_mgen_alias_2): Remove.
* sysdeps/generic/math-type-macros-double.h
[NO_LONG_DOUBLE && !declare_mgen_alias_2] (declare_mgen_alias_2):
Likewise.
* math/s_ldexp_template.c (M_SUF (__wrap_scalbn)): Define strong
alias.
(ldexp): Define with declare_mgen_alias.
(scalbn): Likewise.
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This one is a little more tricky since it is built both for
libm and libc, and exports multiple aliases.
To simplify aliasing, a new macro is introduced which handles
aliasing to two symbols. By default, it just applies
declare_mgen_alias to both target symbols.
Likewise, the makefile is tweaked a little to generate
templates for shared files too, and a new rule is added
to build m_*.c objects from the objpfx directory.
Verified there are no symbol or code changes using a script
to diff the *_ldexp* object files on s390x, aarch64, arm,
x86_64, and ppc64.
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